Nevermind. I found the drains. What a crappy design. The only goog way I could see to clean it was to slip it out from under the coil so that's what I did. Then took it into the sink and cleaned it real good. Put it back in the camper poured some water in it and out the water drained.
Should be ready for the next camping trip.
Even though nobody relied to the post, just posting here gave me the moral support I needed to keep working at it.